Respostas

2013-11-14T15:43:14-02:00
3  -  [2  : 1] =
7      7    5

3 - [2 x 5] =
7    7    1

3 - 10 =
7    7
- 7  =
  7
- 1
Resposta: - 1
2013-11-14T22:56:54-02:00
 \frac{3}{7} -  ( \frac{ \frac{2}{7} }{ \frac{1}{5} } )

 \frac{3}{7} -( \frac{2}{7}. \frac{5}{1}  )

\boxed{ \boxed{\frac{3}{7} - \frac{10}{7} = -\frac{7}{7} =-1}}
me explica vc multiplicou ou dividiu